Patents by Inventor Gang Chang
Gang Chang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9606645Abstract: A display apparatus is provided. The display device includes pixels, a data line, a first current compensation unit, a second current compensation unit, and a control unit. The first current compensation unit is configured for providing a first current to pixels through the data line. The first current is configured for compensating a leakage current that flows out of the data line. The second current compensation unit is configured for sinking a second current from pixels through the data line. The second current is configured for compensating the leakage current that flows into the data line. The control unit is configured for controlling the first current compensation unit to provide the first current or controlling the second current compensation unit to sink the second current according to a voltage of the data line.Type: GrantFiled: September 16, 2014Date of Patent: March 28, 2017Assignee: AU OPTRONICS CORPORATIONInventors: Chun-Chieh Lin, Hua-Gang Chang, Chih-Cheng Chen
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Patent number: 9495904Abstract: A light emitting diode module includes a light emitting unit and a light emitting diode circuit. The light emitting diode circuit includes four transistors and a storage capacitor. A first transistor includes a first end for receiving a data signal, and a control end. The storage capacitor has a first end coupled to a second end of the first transistor. A second transistor has a first end coupled to a first voltage source, and a control end. A third transistor has a first end coupled to a second end of the second transistor, and a control end coupled to a second end of the storage capacitor. A fourth transistor has a first end coupled to the second end of the storage capacitor, a control end, and a second end coupled to the second end of the second transistor.Type: GrantFiled: August 19, 2013Date of Patent: November 15, 2016Assignee: AU OPTRONICS CORP.Inventors: Wei-Chu Hsu, Li-Wei Liu, Hua-Gang Chang
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Patent number: 9384693Abstract: A pixel circuit includes one organic light emitting diode, five first transistors and two capacitors. The first and third transistors have terminals coupled to a first voltage. The second transistor has two terminals coupled to another terminal of the first transistor and a second voltage through the organic light emitting diode, respectively. The first capacitor has a terminal coupled to one terminal of the second transistor. The third transistor has a terminal coupled to one terminal of the first capacitor. The second capacitor has two terminals coupled to a control terminal of the second transistor and another terminal of the first capacitor, respectively. The fourth transistor has two terminals coupled to the terminal of the second transistor and a control terminal of the second transistor, respectively. The fifth transistor has a terminal coupled to the another terminal of the second transistor. A display apparatus is also provided.Type: GrantFiled: January 21, 2014Date of Patent: July 5, 2016Assignee: AU OPTRONICS CORP.Inventors: Hua-Gang Chang, Yu-Shian Lin
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Patent number: 9349324Abstract: A pixel circuit includes four transistors, two capacitors and a light emitting element. A gate of first transistor receives a scan signal and a source/drain thereof receives a display data. A terminal of first capacitor couples to another source/drain of first transistor. A gate and a source/drain of second transistor couple to another terminal of first capacitor; and another source/drain thereof receives a switch signal. A terminal of second capacitor receives a reset signal; and another terminal thereof couples to another terminal of first capacitor. A gate of third transistor couples to a terminal of first capacitor. A gate of fourth transistor receives an enable signal; a source/drain thereof couples to a first power supply voltage; and another source/drain thereof couples to one source/drain of third transistor. The anode and cathode of the light emitting element couple to one source/drain of third transistor and a second power supply voltage, respectively.Type: GrantFiled: July 28, 2014Date of Patent: May 24, 2016Assignee: AU OPTRONICS CORP.Inventors: Hua-Gang Chang, Man-Wen Shih, Ching-Kai Lo, Chien-Chung Huang
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Publication number: 20160141051Abstract: A shift register comprises a first switch, a second switch, a third switch, and a fourth switch. The first switch selectively conducts a first clock signal to a first output terminal as a first output signal based on a voltage level over the control terminal. The second switch selectively forces a voltage level of the first output signal to be equal to a voltage level of a second clock signal based on both of the second clock signal and a third clock signal inverted to the second clock signal. The third switch selectively defines a voltage over the control terminal to be a first voltage based on a first input signal. The fourth switch selectively forces the voltage level over the control terminal to be equal to the voltage level of the second clock signal based on both of the second clock signal and the third clock signal.Type: ApplicationFiled: July 21, 2015Publication date: May 19, 2016Inventors: Ya-Ling Chen, Ching-Kai Lo, Chien-Chung Huang, Hua-Gang Chang
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Patent number: 9324271Abstract: A pixel driver includes an input unit, a power-switching unit, a voltage-dividing unit, a pixel-driving unit and a shorting unit. The input unit outputs a data voltage according to a first scan signal and a data signal. The power-switching unit outputs a first power voltage according to a first power voltage and a power-controlling signal. The voltage-dividing unit adjusts a control voltage according to a second scan signal. The pixel-driving unit includes a control terminal, a first terminal and a second terminal. The pixel-driving unit provides a driving current to an LED according to the voltage difference between the control terminal and the second terminal. The shorting unit connects the control terminal to the first terminal according to the first scan signal.Type: GrantFiled: December 18, 2013Date of Patent: April 26, 2016Assignee: AU OPTRONICS CORPORATIONInventors: Hua-Gang Chang, Li-Wei Liu
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Publication number: 20150287364Abstract: A pixel circuit includes four transistors, two capacitors and a light emitting element. A gate of first transistor receives a scan signal and a source/drain thereof receives a display data. A terminal of first capacitor couples to another source/drain of first transistor. A gate and a source/drain of second transistor couple to another terminal of first capacitor; and another source/drain thereof receives a switch signal. A terminal of second capacitor receives a reset signal; and another terminal thereof couples to another terminal of first capacitor. A gate of third transistor couples to a terminal of first capacitor. A gate of fourth transistor receives an enable signal; a source/drain thereof couples to a first power supply voltage; and another source/drain thereof couples to one source/drain of third transistor. The anode and cathode of the light emitting element couple to one source/drain of third transistor and a second power supply voltage, respectively.Type: ApplicationFiled: July 28, 2014Publication date: October 8, 2015Inventors: Hua-Gang CHANG, Man-Wen SHIH, Ching-Kai LO, Chien-Chung HUANG
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Patent number: 9153173Abstract: A pixel structure and a driving method thereof are disclosed. The driving method includes following steps. During a first displaying frame period, a threshold voltage of a transistor for driving a light-emitting diode is stored in a first capacitor, and a first data voltage is stored in a second capacitor. The threshold voltage stored in the first capacitor is utilized for compensation during the first displaying frame period. During a second displaying frame period, a second data voltage is stored in the second capacitor, and the threshold voltage stored in the first capacitor during the first frame displaying period is still utilized for compensation during the second displaying frame period.Type: GrantFiled: August 4, 2014Date of Patent: October 6, 2015Assignee: AU OPTRONICS CORPORATIONInventors: Hua-Gang Chang, Yi-Cian Chen
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Publication number: 20150194094Abstract: A display apparatus is provided. The display device includes pixels, a data line, a first current compensation unit, a second current compensation unit, and a control unit. The first current compensation unit is configured for providing a first current to pixels through the data line. The first current is configured for compensating a leakage current that flows out of the data line. The second current compensation unit is configured for sinking a second current from pixels through the data line. The second current is configured for compensating the leakage current that flows into the data line. The control unit is configured for controlling the first current compensation unit to provide the first current or controlling the second current compensation unit to sink the second current according to a voltage of the data line.Type: ApplicationFiled: September 16, 2014Publication date: July 9, 2015Inventors: Chun-Chieh LIN, Hua-Gang CHANG, Chih-Cheng CHEN
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Publication number: 20150130779Abstract: A pixel structure and a driving method thereof are disclosed. The driving method includes following steps. During a first displaying frame period, a threshold voltage of a transistor for driving a light-emitting diode is stored in a first capacitor, and a first data voltage is stored in a second capacitor. The threshold voltage stored in the first capacitor is utilized for compensation during the first displaying frame period. During a second displaying frame period, a second data voltage is stored in the second capacitor, and the threshold voltage stored in the first capacitor during the first frame displaying period is still utilized for compensation during the second displaying frame period.Type: ApplicationFiled: August 4, 2014Publication date: May 14, 2015Inventors: Hua-Gang CHANG, Yi-Cian CHEN
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Patent number: 8947326Abstract: A pixel structure, driving method thereof and self-emitting display using the same is disclosed. The pixel structure includes four transistors and two capacitors to compensate illuminating effect in both of a non-synchronous display mode and a synchronous display mode.Type: GrantFiled: November 16, 2012Date of Patent: February 3, 2015Assignee: Au Optronics Corp.Inventors: Hua-Gang Chang, Tsung-Ting Tsai
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Publication number: 20140368487Abstract: A pixel driver includes an input unit, a power-switching unit, a voltage-dividing unit, a pixel-driving unit and a shorting unit. The input unit outputs a data voltage according to a first scan signal and a data signal. The power-switching unit outputs a first power voltage according to a first power voltage and a power-controlling signal. The voltage-dividing unit adjusts a control voltage according to a second scan signal. The pixel-driving unit includes a control terminal, a first terminal and a second terminal. The pixel-driving unit provides a driving current to an LED according to the voltage difference between the control terminal and the second terminal. The shorting unit connects the control terminal to the first terminal according to the first scan signal.Type: ApplicationFiled: December 18, 2013Publication date: December 18, 2014Applicant: AU Optronics CorporationInventors: Hua-Gang CHANG, Li-Wei LIU
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Publication number: 20140339998Abstract: A light emitting diode module includes a light emitting unit and a light emitting diode circuit. The light emitting diode circuit includes four transistors and a storage capacitor. A first transistor includes a first end for receiving a data signal, and a control end. The storage capacitor has a first end coupled to a second end of the first transistor. A second transistor has a first end coupled to a first voltage source, and a control end. A third transistor has a first end coupled to a second end of the second transistor, and a control end coupled to a second end of the storage capacitor. A fourth transistor has a first end coupled to the second end of the storage capacitor, a control end, and a second end coupled to the second end of the second transistor.Type: ApplicationFiled: August 19, 2013Publication date: November 20, 2014Applicant: AU Optronics Corp.Inventors: Wei-Chu Hsu, Li-Wei Liu, Hua-Gang Chang
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Publication number: 20140332775Abstract: A pixel circuit includes one organic light emitting diode, five first transistors and two capacitors. The first and third transistors have terminals coupled to a first voltage. The second transistor has two terminals coupled to another terminal of the first transistor and a second voltage through the organic light emitting diode, respectively. The first capacitor has a terminal coupled to one terminal of the second transistor. The third transistor has a terminal coupled to one terminal of the first capacitor. The second capacitor has two terminals coupled to a control terminal of the second transistor and another terminal of the first capacitor, respectively. The fourth transistor has two terminals coupled to the terminal of the second transistor and a control terminal of the second transistor, respectively. The fifth transistor has a terminal coupled to the another terminal of the second transistor. A display apparatus is also provided.Type: ApplicationFiled: January 21, 2014Publication date: November 13, 2014Applicant: AU OPTRONICS CORPInventors: Hua-Gang CHANG, Yu-Shian LIN
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Patent number: 8878755Abstract: In one aspect of the invention, a method of driving an OLED display includes providing scan signals and data signals and applying the scan signals to scan lines and the data signals to the data lines, respectively. Each scan signal is characterized with a waveform having a compensation duration and a scan duration immediately following the compensation duration. The waveform has a first voltage and a second voltage periodically and alternately varied from one another defining a period in the compensation duration, and has the first voltage in the scan duration. The period is equal to the scan duration but shorter than the compensation duration. As such, during the compensation duration of a scan signal, pixels of a corresponding pixel row are charged for compensation, and during the scan duration, the data signals are written into the pixels of the corresponding pixel row for driving the OLEDs thereof.Type: GrantFiled: August 23, 2012Date of Patent: November 4, 2014Assignee: AU Optronics CorporationInventors: Hua-Gang Chang, Tsung-Ting Tsai
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Publication number: 20140055434Abstract: In one aspect of the invention, a method of driving an OLED display includes providing scan signals and data signals and applying the scan signals to scan lines and the data signals to the data lines, respectively. Each scan signal is characterized with a waveform having a compensation duration and a scan duration immediately following the compensation duration. The waveform has a first voltage and a second voltage periodically and alternately varied from one another defining a period in the compensation duration, and has the first voltage in the scan duration. The period is equal to the scan duration but shorter than the compensation duration. As such, during the compensation duration of a scan signal, pixels of a corresponding pixel row are charged for compensation, and during the scan duration, the data signals are written into the pixels of the corresponding pixel row for driving the OLEDs thereof.Type: ApplicationFiled: August 23, 2012Publication date: February 27, 2014Applicant: AU OPTRONICS CORPORATIONInventors: Hua-Gang Chang, Tsung-Ting Tsai
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Publication number: 20130169611Abstract: A pixel structure, driving method thereof and self-emitting display using the same is disclosed. The pixel structure includes four transistors and two capacitors to compensate illuminating effect in both of a non-synchronous display mode and a synchronous display mode.Type: ApplicationFiled: November 16, 2012Publication date: July 4, 2013Applicant: AU OPTRONICS CORP.Inventors: Hua-Gang CHANG, Tsung-Ting TSAI
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Publication number: 20120288885Abstract: The present invention relates to a method, and a kit, for measuring the enzymatic activity of cytochrome P450 comprehensively and with high efficiency and accuracy, wherein an oxygen sensing layer and a cytochrome P450-supporting layer are vertically integrated on a chip, and cytochrome P450 is supported in a hydrophilic polymer matrix in the cytochrome P450-supporting layer, the cytochrome P450 generates NADPH by being irradiated with light in the presence of at least one caged compound selected from the group consisting of caged-NADP and caged-G6P, an enzyme utilizing NADPH as a coenzyme (i.e., cytochrome P450 reductase) and a substrate thereof to supply NADP and/or G6P from the caged compound to generate NADPH to start the reaction between the enzyme and a substrate.Type: ApplicationFiled: August 27, 2010Publication date: November 15, 2012Applicants: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLGOY, NATIONAL UNIVERSITY CORPORATION KOBE UNIVERSITYInventors: Hiromasa Imaishi, Kenichi Morigaki, Yoshiro Tatsu, Gang Chang